implemented keep alive

OmobiDisplayApp/OmobiDisplayApp.pro

@@ -47,3 +47,8 @@ contains(ANDROID_TARGET_ARCH,armeabi-v7a) {
 }
 
 ANDROID_ABIS = armeabi-v7a
+
+contains(ANDROID_TARGET_ARCH,) {
+    ANDROID_ABIS = \
+        armeabi-v7a
+}

OmobiDisplayApp/omobidisplaybackend.cpp

@@ -1,13 +1,19 @@
-    #include "omobidisplaybackend.h"
+#include "omobidisplaybackend.h"
 
 OmobiDisplayBackend::OmobiDisplayBackend(QObject *parent) : QObject(parent)
 {
     this->ble = new QBluetoothLeUart();
+    this->ble->setUUIDs("92fecb20-1406-426a-afa5-cd5c1f306462", "92fecb21-1406-426a-afa5-cd5c1f306462", "92fecb22-1406-426a-afa5-cd5c1f306462");
     this->displayTextModel = new OmobiDisplayTextModel(this);
     this->textSetsBuffer.clear();
     this->displayBrightness = -1;
     this->waitingCommands = 0;
 
+    this->keepAliveTimer = new QTimer(this);
+    this->keepAliveTimer->setInterval(5000);
+    this->keepAliveTimer->setSingleShot(false);
+    connect(this->keepAliveTimer, &QTimer::timeout, this, &OmobiDisplayBackend::sendBluetoothKeepAlive);
+
     connect(this->ble, &QBluetoothLeUart::stateChanged, this, &OmobiDisplayBackend::handleBluetoothStateChange);
     connect(this->ble, &QBluetoothLeUart::foundNewDevice, this, &OmobiDisplayBackend::handleFoundNewDevice);
     connect(this->ble, &QBluetoothLeUart::dataReceived, this, &OmobiDisplayBackend::handleBluetoothDataReceived);
@@ -56,6 +62,11 @@ void OmobiDisplayBackend::handleBluetoothStateChange(QBluetoothLeUart::Bluetooth
         break;
     }
     }
+
+    if(state == QBluetoothLeUart::Connected)
+        this->keepAliveTimer->start();
+    else if(this->keepAliveTimer->isActive())
+        this->keepAliveTimer->stop();
 }
 
 void OmobiDisplayBackend::handleBluetoothDeviceConected() {
@@ -110,6 +121,14 @@ void OmobiDisplayBackend::sendBluetoothCommand(OmobiDisplayCommand command, QVar
     this->ble->sendData(doc.toJson(QJsonDocument::Compact));
 }
 
+void OmobiDisplayBackend::sendBluetoothKeepAlive() {
+    QJsonDocument doc = QJsonDocument::fromVariant(QVariantMap{{"header", KeepAliveCommand}});
+
+    qDebug() << "Sending keep alive: \n" << qPrintable(doc.toJson(QJsonDocument::Indented));
+
+    this->ble->sendData(doc.toJson(QJsonDocument::Compact));
+}
+
 void OmobiDisplayBackend::handleBluetoothDataReceived(QString s){
     qDebug() << "New data: \n" << qPrintable(s);
 
@@ -124,6 +143,13 @@ void OmobiDisplayBackend::handleBluetoothDataReceived(QString s){
     OmobiDisplayStatusCode status = OmobiDisplayStatusCode(doc.toVariant().toMap()["status"].toInt());
 
     switch (header) {
+    case AuthorizeSessionCommand: {
+        break;
+    }
+    case KeepAliveCommand: {
+        break;
+    }
+
     case GetAllTextSetsCommand: {
         // indicates that all existing txt sets have been sent over after GetAllTextSetsCommand was called
         if(status != Success)

OmobiDisplayApp/omobidisplaybackend.h

@@ -2,6 +2,7 @@
 #define OMOBIDISPLAYBACKEND_H
 
 #include <QObject>
+#include <QTimer>
 #include <QJsonDocument>
 
 #include <qbluetoothleuart.h>
@@ -31,6 +32,8 @@ public:
 
 private:
     enum OmobiDisplayCommand {
+        AuthorizeSessionCommand = 0,
+        KeepAliveCommand = 1,
         GetAllTextSetsCommand = 10,
         GetTextSetParameterCommand = 11,
         GetDisplayBrightnessCommand = 12,
@@ -45,6 +48,7 @@ private:
 
     OmobiDisplayAppState state;
     QBluetoothLeUart *ble;
+    QTimer *keepAliveTimer;
     OmobiDisplayTextModel* displayTextModel;
     int waitingCommands;
     QList<QMap<int, QVariant>> textSetsBuffer;
@@ -68,6 +72,7 @@ private slots:
     void handleDisplayTextModelRowsRemoved(const QModelIndex &parent, int first, int last);
 
     void sendBluetoothCommand(OmobiDisplayCommand command, QVariant data = QVariant());
+    void sendBluetoothKeepAlive();
     void handleBluetoothDataReceived(QString s);
     void updateDisplayTextSetParameter(int index, int parameter);
     void updateDisplayTextSetParameter(int index, int parameter, QString value);